[PATCH v1 03/11] cpufreq: tegra20: Remove EMC clock usage

Dmitry Osipenko
2018-05-17T18:01:20Z

The EMC driver has been gone 4 years ago, since the commit a7cbe92cef27
("ARM: tegra: remove tegra EMC scaling driver"). Remove the EMC clock
usage as it does nothing. We may consider re-implementing the EMC scaling
later, probably using PM Memory Bandwidth QoS API.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/cpufreq/tegra20-cpufreq.c | 22 ----------------------
1 file changed, 22 deletions(-)

diff --git a/drivers/cpufreq/tegra20-cpufreq.c b/drivers/cpufreq/tegra20-cpufreq.c
index dd8a76a64a8e..693f9067ba8a 100644
--- a/drivers/cpufreq/tegra20-cpufreq.c
+++ b/drivers/cpufreq/tegra20-cpufreq.c
@@ -44,7 +44,6 @@ static struct cpufreq_frequency_table freq_table[] = {
static struct clk *cpu_clk;
static struct clk *pll_x_clk;
static struct clk *pll_p_clk;
-static struct clk *emc_clk;
static bool pll_x_prepared;

static unsigned int tegra_get_intermediate(struct cpufreq_policy *policy,
@@ -95,17 +94,6 @@ static int tegra_target(struct cpufreq_policy *policy, unsigned int index)
unsigned int ifreq = clk_get_rate(pll_p_clk) / 1000;
int ret = 0;

- /*
- * Vote on memory bus frequency based on cpu frequency
- * This sets the minimum frequency, display or avp may request higher
- */
- if (rate >= 816000)
- clk_set_rate(emc_clk, 600000000); /* cpu 816 MHz, emc max */
- else if (rate >= 456000)
- clk_set_rate(emc_clk, 300000000); /* cpu 456 MHz, emc 150Mhz */
- else
- clk_set_rate(emc_clk, 100000000); /* emc 50Mhz */
-
/*
* target freq == pll_p, don't need to take extra reference to pll_x_clk
* as it isn't used anymore.
@@ -141,14 +129,12 @@ static int tegra_cpu_init(struct cpufreq_policy *policy)
if (policy->cpu >= NUM_CPUS)
return -EINVAL;

- clk_prepare_enable(emc_clk);
clk_prepare_enable(cpu_clk);

/* FIXME: what's the actual transition time? */
ret = cpufreq_generic_init(policy, freq_table, 300 * 1000);
if (ret) {
clk_disable_unprepare(cpu_clk);
- clk_disable_unprepare(emc_clk);
return ret;
}

@@ -160,7 +146,6 @@ static int tegra_cpu_init(struct cpufreq_policy *policy)
static int tegra_cpu_exit(struct cpufreq_policy *policy)
{
clk_disable_unprepare(cpu_clk);
- clk_disable_unprepare(emc_clk);
return 0;
}

@@ -192,19 +177,12 @@ static int __init tegra_cpufreq_init(void)
if (IS_ERR(pll_p_clk))
return PTR_ERR(pll_p_clk);

- emc_clk = clk_get_sys("cpu", "emc");
- if (IS_ERR(emc_clk)) {
- clk_put(cpu_clk);
- return PTR_ERR(emc_clk);
- }
-
return cpufreq_register_driver(&tegra_cpufreq_driver);
}

static void __exit tegra_cpufreq_exit(void)
{
cpufreq_unregister_driver(&tegra_cpufreq_driver);
- clk_put(emc_clk);
clk_put(cpu_clk);
}

--
2.17.0